CN113418639B - Integrated device for monitoring mining stress of shallow coal seam - Google Patents
Integrated device for monitoring mining stress of shallow coal seam Download PDFInfo
- Publication number
- CN113418639B CN113418639B CN202110696242.9A CN202110696242A CN113418639B CN 113418639 B CN113418639 B CN 113418639B CN 202110696242 A CN202110696242 A CN 202110696242A CN 113418639 B CN113418639 B CN 113418639B
- Authority
- CN
- China
- Prior art keywords
- connecting rod
- stress
- fixed
- rod
- outer cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses an integrated device for monitoring mining stress of a shallow coal seam, which comprises a connecting rod, a stress sensing assembly and a strain sensing assembly, wherein the connecting rod is a hollow circular tube-shaped rod, an adjusting screw concentric with the connecting rod is rotatably arranged in the connecting rod, one or more expansion assemblies are distributed on the outer wall of the connecting rod along the axial direction of the connecting rod, and the radial length of the expansion assemblies can be adjusted by rotating the adjusting screw; a plurality of stress sensing assemblies are distributed on the expansion assembly along the circumferential direction; one or more fixing seats are further distributed on the outer wall of the connecting rod along the length direction of the connecting rod, and a plurality of strain sensing assemblies extending along the radial direction are uniformly distributed on the circumference of the fixing seats in the circumferential direction. Compared with the prior art, the device is simple to operate, easy to recover, capable of adapting to monitoring holes with different diameters, uniform in stress of the sensor, high in precision, and capable of monitoring the ground stress and the space movement deformation conditions at the same time.
Description
Technical Field
The invention relates to the technical field of coal seam monitoring devices, in particular to an integrated device for monitoring mining stress of a shallow coal seam.
Background
Shallow coal seams are generally considered to be buried less than 150 meters deep, the base load ratio is less than 1, and the roof plate represents the structural characteristics of a single key layer. The buried depth, the bedrock is thin, and the overlying loose sand layer is the typical occurrence characteristic of the coal bed, and the main mine pressure characteristic of the working surface of the shallow buried coal bed is that the old top slope breaking motion directly affects the earth surface. The top plate is not easy to form a stable structure, and the phenomenon of obvious dynamic load exists in the process of coming pressure. The bracket is in a given unstable loading state. The top plate breaking movement of the working face of the shallow coal seam has the particularity, and the monitoring of the mining stress plays an important guiding role in the mining operation.
The mining stress is a stress field after the stress is redistributed on the surrounding rocks around the space body on the basis of the stress of the original rock after the underground space is excavated. Mining stress is the superposition effect of space body excavation disturbance and an original rock stress field, accurate mining stress data is the premise of reasonably carrying out tunnel excavation, tunnel development, tunnel arrangement, tunnel support design and working face mining design, and data guarantee is provided for decision and design scientization of geotechnical engineering and mining engineering.
The existing crustal stress measuring method comprises a stress recovery method, a stress relief method and the like, the operation process is complex and tedious, whether a sensor is in close contact with surrounding rocks or not determines whether stress measurement is accurate or not, errors are easily caused by uneven hole walls, a displacement sensor needs to be additionally arranged to measure the spatial movement deformation condition, the positioning and fixing operations of the displacement sensor are complex, and the measurement cannot be simultaneously and rapidly carried out. In addition, the existing ground stress measurement method cannot realize the real-time acquisition of the surrounding rock mining stress, and the stress monitoring result cannot reflect the disturbance of engineering construction to the ground stress monitoring method and cannot realize the dynamic monitoring of the stress.
Therefore, there is a need for an integrated device for monitoring mining stress of shallow coal seams to solve the above-mentioned problems in the background art.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: an integrated device for monitoring mining stress of a shallow coal seam comprises a connecting rod, a stress sensing assembly and a strain sensing assembly, wherein the connecting rod is a hollow circular tube-shaped rod, an adjusting screw concentric with the connecting rod is rotatably arranged in the connecting rod, one end of the adjusting screw is longer than the end face of the adjusting screw, and a handle is fixed on the adjusting screw;
one or more expansion components are distributed on the outer wall of the connecting rod along the axial direction of the connecting rod, and the radial length of the expansion components can be adjusted by rotating an adjusting screw rod; a plurality of stress sensing assemblies are distributed on the expansion assembly along the circumferential direction;
one or more fixing seats are further distributed on the outer wall of the connecting rod along the length direction of the connecting rod, and a plurality of strain sensing assemblies extending along the radial direction are uniformly distributed on the circumference of the fixing seats in the circumferential direction.
Further, preferably, the expansion assembly comprises a fixed hinge sleeve, a movable hinge sleeve and a scissor connecting rod, the fixed hinge sleeve is fixedly sleeved on the periphery of the connecting rod, and the movable hinge sleeve is slidably sleeved on the periphery of the connecting rod;
the fixed hinge sleeve and the movable hinge sleeve are hinged to a plurality of groups of shear fork connecting rods in an evenly distributed mode, each shear fork connecting rod is an X-shaped rotatable connecting rod, two ends of one side of each shear fork connecting rod are hinged to the fixed hinge sleeve and the movable hinge sleeve respectively, one end of each shear fork connecting rod is hinged to one side of the pressure base through a fixed hinge, the other end of each shear fork connecting rod is hinged to the other side of the pressure base through a sliding groove in a sliding mode, and the pressure base is a long-strip-shaped plate.
Preferably, a through groove penetrating through the outer wall of the connecting rod is formed in a gap between the scissors connecting rods corresponding to the movable range of the movable hinge sleeve, the movable hinge sleeve is fixedly connected with an adjusting nut inside the connecting rod through a connecting rib penetrating through the through groove, and the adjusting nut is in threaded connection with the adjusting screw rod.
Further, as a preferred option, the strain sensing assembly comprises pressure sensors, a plurality of the pressure sensors are distributed in the pressure base of the expansion assembly, the other side of each pressure sensor is connected to a pressure shoe together, the pressure shoe is an arc-shaped tile-shaped plate, and an inner wall filling assembly is arranged in one side, away from the pressure sensors, of the pressure shoe.
Further, preferably, the inner wall filling assembly comprises a rear bag and a front bag, the rear bag is fixedly connected with the tile, and the front bag is fixed on the side, away from the tile, of the rear bag;
the front bag and the back bag are made of soft materials and are respectively filled with a reagent mixed with an expanding agent.
Furthermore, preferably, the rear bag is connected with the edge of the front bag in a sealing manner, the gap of the rear bag and the front bag is a closed cavity, a connecting net is fixed in the cavity, and a plurality of puncture needles with two sharp ends are distributed in the connecting net.
Further, preferably, the front bag and the pressing tile are fixedly connected through a connecting layer, and the connecting layer is a polystyrene layer.
Further, preferably, the strain sensing assembly comprises an outer cylinder, the outer cylinder is fixedly connected with the fixed seat, the axial direction of the outer cylinder extends along the radial direction of the connecting rod, the outer cylinder is a hollow cylinder, a push rod which is in telescopic connection with the outer cylinder penetrates through the end face of the outer cylinder, which is far away from the fixed seat, a movable sleeve is slidably arranged in the outer cylinder, and the movable sleeve is fixedly connected with the push rod;
a spring is arranged between one end of the ejector rod and one end of the outer barrel, which is close to the fixed seat, and the ejector rod is attached to one end, which is far away from the fixed seat, of the outer barrel through the spring in a natural state.
Further, preferably, the ejector rod and the movable sleeve are both hollow structures with inner holes, a resistance wire cylinder concentric with the outer cylinder is fixed in the outer cylinder, and the diameter of the resistance wire cylinder is smaller than the inner holes of the ejector rod and the movable sleeve and the inner diameter of the spring;
the resistance wire barrel is formed by winding a resistance wire on an insulating barrel, one end of the resistance wire barrel, which is close to the fixed seat, is led out by a lead, and insulating paint is coated between the resistance wires;
a conductive needle is fixed between the resistance wire barrel and the spring on one side of the movable sleeve close to the fixed seat, and the conductive needle is in contact conduction with the resistance wire barrel;
and a resistance meter is arranged between the conducting needle and a lead led out from one end of the resistance wire barrel close to the fixed seat.
Further, preferably, an electromagnet is fixed in one end, close to the fixed seat, of the outer cylinder, and the movable sleeve is made of a magnetic conductive material, so that when the electromagnet is powered on, magnetic force enabling the movable sleeve to overcome the elastic force of the spring to be close to the electromagnet can be provided.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, the adjusting screw rod is screwed to change the position of the movable hinge sleeve, so that the shear fork connecting rod does shear fork movement, the distance between the pressure base and the connecting rod is changed, a plurality of circumferentially distributed pressure shoes can be opened or condensed, and the pressure shoes can be suitable for being supported in monitoring holes with different diameters.
According to the invention, when the expansion assembly pushes the pressure tile to be attached to and extrude the inner wall of the monitoring hole, the puncture needle pierces the front bag and the rear bag, the mixed expanding agent in the puncture needle overflows and is mixed together to generate a chemical reaction to expand, and a gap between the inner wall of the monitoring hole and the pressure tile is filled, so that the pressure tile can be completely attached to the inner wall of the monitoring hole, the pressure sensor under the pressure tile is ensured to be uniformly stressed, and the monitoring error caused by the local stress concentration of the pressure tile due to the unevenness of the inner wall of the monitoring hole is prevented;
according to the invention, when the electromagnet is powered on, the ejector rod can be retracted into the outer barrel, the length of the ejector rod is shortened, so that the ejector rod can be conveniently sent into monitoring holes with different apertures, the electromagnet is powered off, the ejector rod is jacked to the inner wall of the monitoring hole, the initial resistance value of the resistance meter is obtained, the position of the ejector rod is obtained, and the change condition of confined pressure in the detection hole and the spatial movement deformation condition of the monitoring hole can be recorded in the monitoring process by combining the displacement of each ejector rod distributed circumferentially;
and because the expansion assembly and the stress sensing assembly support and center the inner wall of the monitoring hole, the stability of the strain sensing assembly and the concentricity of the strain sensing assembly and the monitoring hole are ensured, and the combined integrated device can play the effects of higher precision and less disturbance influence compared with the strain sensing device in the prior art.
Drawings
FIG. 1 is a schematic structural diagram of an integrated device for monitoring mining stress of a shallow coal seam;
FIG. 2 is a schematic structural diagram of an integrated stress sensing assembly device for monitoring mining stress of a shallow coal seam;
FIG. 3 is a schematic structural diagram of a stress sensing assembly profile integrated apparatus for monitoring mining stress of a shallow coal seam;
FIG. 4 is a schematic structural diagram of a strain sensing assembly of an integrated device for monitoring mining stress of a shallow coal seam;
in the figure: 1. a connecting rod; 11. a through groove; 2. adjusting the screw rod; 3. an expansion assembly; 4. a stress sensing component; 5. a fixed seat; 6. a strain sensing component; 31. fixing the hinge sleeve; 32. a movable hinge sleeve; 321. connecting ribs; 322. adjusting the nut; 33. a scissor linkage; 34. fixing the hinge; 35. a chute; 36. a pressure base; 42. a pressure sensor; 43. pressing tiles; 44. an inner wall filling assembly; 441. a posterior capsular bag; 442. an anterior capsular bag; 443. connecting a net; 444. a needle; 45. a connecting layer; 61. an outer cylinder; 62. a top rod; 63. a resistance wire cylinder; 64. a movable sleeve; 65. a conductive pin; 66. a spring; 67. an electromagnet.
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, an integrated device for monitoring mining stress of a shallow coal seam includes a connecting rod 1, a stress sensing component 4, and a strain sensing component 6, where the connecting rod 1 is a hollow circular tube-shaped rod, and an adjusting screw 2 concentric with the connecting rod is rotatably disposed in the connecting rod, and one end of the adjusting screw 2 is longer than an end face of the adjusting screw and is fixed with a handle;
one or more expansion components 3 are distributed on the outer wall of the connecting rod 1 along the axial direction of the connecting rod, and the radial length of the expansion components 3 can be adjusted by rotating the adjusting screw 2; a plurality of stress sensing assemblies 4 are distributed on the expansion assembly 3 along the circumferential direction;
one or more fixed seats 5 are further distributed on the outer wall of the connecting rod 1 along the length direction of the connecting rod, and a plurality of strain sensing assemblies 6 extending along the radial direction are uniformly distributed on the circumferential circumference of each fixed seat 5;
the axial direction, the radial direction and the axial direction are mainly related to the connecting rod 1.
Referring to fig. 2 and fig. 3, in the present embodiment, the expansion assembly 3 includes a fixed hinge sleeve 31, a movable hinge sleeve 32, and a scissor link 33, the fixed hinge sleeve 31 is fixedly sleeved on the periphery of the link rod 1, and the movable hinge sleeve 32 is slidably sleeved on the periphery of the link rod 1;
the circumferences of the outer walls of the fixed hinge sleeve 31 and the movable hinge sleeve 32 are uniformly and respectively hinged with a plurality of groups of scissor connecting rods 33, each scissor connecting rod 33 is an X-shaped rotatable connecting rod, two ends of one side of each scissor connecting rod 33 are respectively hinged in the fixed hinge sleeve 31 and the movable hinge sleeve 32, one end of two ends of the other side of each scissor connecting rod is hinged on one side of a pressure base 36 through a fixed hinge 34, the other end of each scissor connecting rod is slidably hinged on the other side of the pressure base 36 through a sliding chute 35, and the pressure base 36 is a long strip plate;
that is, by changing the position of the movable hinge sleeve 32, the scissors link 33 can be made to perform scissors movements, thereby changing the distance of the pressure foot 36 from the connecting rod 1.
In this embodiment, a through groove 11 penetrating into the outer wall of the connecting rod 1 is opened in a gap between the scissors connecting rods 33 corresponding to the movable range of the movable hinge sleeve 32, the movable hinge sleeve 32 is fixedly connected with an adjusting nut 322 inside the connecting rod 1 through a connecting rib 321 penetrating through the through groove 11, and the adjusting nut 322 is in threaded connection with the adjusting screw 2;
that is, by screwing the adjusting screw 2, the adjusting nut 322 can be driven to slide the movable hinge sleeve 32 in the connecting rod 1.
In the present embodiment, the stress sensing assembly 4 includes a plurality of pressure sensors 42, the pressure sensors 42 are distributed in the pressure base 36 of the expansion assembly 3, the other sides of the pressure sensors 42 are commonly connected to a pressure shoe 43, the pressure shoe 43 is an arc-shaped tile-shaped plate, and an inner wall filling assembly 44 is disposed in one side of the pressure shoe 43 away from the pressure sensors 42.
In this embodiment, the inner wall filling assembly 44 includes a rear bag 441 and a front bag 442, the rear bag 441 is fixedly connected to the tile 43, and the front bag 442 is fixed to a side of the rear bag 441 away from the tile 43;
the anterior and posterior pockets 442, 441 are soft material pockets each containing an agent mixed with a bulking agent.
In this embodiment, the rear bag 441 is connected with the front bag 442 in a sealing manner at the edge, the gap is a closed cavity, a connecting net 443 is fixed in the cavity, and a plurality of needles 444 with two sharp ends are distributed in the connecting net 443.
In one embodiment, the front and rear pockets 442 and 441 contain polyisocyanate and polyether polyol, respectively, and when the expansion assembly 3 pushes the pressure shoe 43 to press against the inner wall of the monitoring hole, the puncture needle 444 pierces the front and rear pockets 442 and 441, the polyisocyanate and polyether polyol therein overflow and mix together to chemically react to form polyurethane, which expands to fill the gap in the inner wall of the monitoring hole, thereby allowing the pressure shoe 43 to completely conform to the inner wall of the monitoring hole.
In this embodiment, the front bladder 442 and the pressing shoe 43 are fixedly connected by the connection layer 45, and the connection layer 45 is a polystyrene layer, which is only capable of being pressed and easily broken when subjected to a shearing force, so that the front bladder 442 and the pressing shoe 43 can be separated during recycling.
Referring to fig. 4, in the present embodiment, the strain sensing assembly 6 includes an outer cylinder 61, the outer cylinder 61 is fixedly connected to the fixing base 5, and the axial direction of the outer cylinder 61 extends along the radial direction of the connecting rod 1, the outer cylinder 61 is a hollow cylinder, a push rod 62 telescopically connected to the outer cylinder is inserted through an end surface of the outer cylinder 61 far away from the fixing base 5, a movable sleeve 64 is slidably disposed in the outer cylinder 61, and the movable sleeve 64 is fixedly connected to the push rod 62;
a spring 66 is arranged between the push rod 62 and one end of the outer cylinder 61 close to the fixed seat 5, and the spring 66 enables the push rod 62 to be attached to one end of the outer cylinder 61 far away from the fixed seat 5 in a natural state.
In this embodiment, the top rod 62 and the movable sleeve 64 are both hollow structures with inner holes, a resistance wire tube 63 concentric with the outer tube 61 is fixed in the outer tube 61, and the diameter of the resistance wire tube 63 is smaller than the inner holes of the top rod 62 and the movable sleeve 64 and the inner diameter of the spring 66;
the resistance wire barrel 63 is formed by winding a resistance wire on an insulating barrel, one end close to the fixed seat 5 is led out by a lead, and insulating paint is arranged between the resistance wires;
a conductive needle 65 is fixed between the resistance wire cylinder 63 and the spring 66 at one side of the movable sleeve 64 close to the fixed seat 5, and the conductive needle 65 is in contact conduction with the resistance wire cylinder 63;
a resistance meter is arranged between the conducting needle 65 and a lead-out wire at one end of the resistance wire barrel 63, which is close to the fixed seat 5;
that is, by pushing the push rod 62 against the inner wall of the monitoring hole, when the inner wall of the monitoring hole shrinks, the push rod 62 pushes the movable sleeve to displace, and the position of the conductive needle 65 on the resistance wire barrel 63 is changed, so that the resistance value recorded by the resistance meter is changed, and the activity condition of the inner wall of the monitoring hole is judged.
In this embodiment, an electromagnet 67 is fixed in one end of the outer cylinder 61 close to the fixed seat 5, and the movable sleeve 64 is made of a magnetic conductive material, so that when the electromagnet 67 is energized, a magnetic force can be provided to enable the movable sleeve 64 to overcome the elastic force of the spring 66 and to be close to the electromagnet 67;
when the electromagnet 67 is electrified, the push rod 62 can be retracted into the outer cylinder 61, so that the length of the push rod is shortened, and the push rod can be conveniently sent into monitoring holes with different apertures.
In specific implementation, drilling a monitoring hole in a shallow coal seam to be monitored, and preferably, wherein the depth of the monitoring hole extends to the position below the bottom plate of the coal seam;
before the device is used, firstly, the adjusting screw rod 2 is screwed, the shear fork connecting rod 33 carries out shear fork movement, the pressure shoe 43 is moved to a position close to the connecting rod 1, and the electromagnet 67 is electrified to enable the ejector rod 62 to retract into the outer cylinder 61, so that the length of the ejector rod is shortened;
then, the device is sent into a monitoring hole, and preferably, at least one of the stress sensing component 4 and the strain sensing component 6 is distributed in the rocks at the top of the coal bed, the coal bed and the bottom plate;
screwing the adjusting screw rod 2 to enable the expansion assembly 3 to push the pressure shoe 43 to be attached to and extrude the inner wall of the monitoring hole, at the moment, the puncture needle 444 pierces the front bag 442 and the rear bag 441, and the mixed expanding agent in the puncture needle overflows and mixes together to generate a chemical reaction to expand so as to fill a gap of the inner wall of the monitoring hole, so that the pressure shoe 43 can be completely attached to the inner wall of the monitoring hole;
the electromagnet 67 is powered off to enable the ejector rod 62 to be ejected to the inner wall of the monitoring hole, the initial resistance value of the resistance meter is measured, the initial position of the ejector rod 62 is obtained, and the initial stress state of the pressure sensor 42 is recorded;
the change condition of confined pressure in the detection hole and the moving deformation condition of the space of the monitoring hole are recorded in the monitoring process, the directional rheology, expansion, deformation, stress distribution and change condition of the coal body around the monitoring hole in a natural state and a mining state can be measured, a pressure relief area, a fracture area and an elastic stress area are measured, and guidance and early warning are given to coal seam mining;
also comprises a device recovery process: firstly, the electromagnet 67 is electrified to retract the ejector rod 62 into the outer cylinder 61 to shorten the length of the ejector rod, then the adjusting screw rod 2 is screwed to move the pressure shoe 43 towards the connecting rod 1, the connecting rod 1 is pulled up and down and screwed in the circumferential direction to break the connecting layer 45 under stress, the connecting layer is separated from the rear bag 441, then the pressure shoe 43 is completely contracted, and the device is pulled out of the monitoring hole.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (5)
1. An integrated device for monitoring mining stress of a shallow coal seam comprises a connecting rod (1), a stress sensing assembly (4) and a strain sensing assembly (6), and is characterized in that the connecting rod (1) is a hollow circular tube-shaped rod, an adjusting screw rod (2) concentric with the connecting rod is rotatably arranged in the connecting rod, one end of the adjusting screw rod (2) is longer than the end face of the adjusting screw rod, and a handle is fixed on the adjusting screw rod;
one or more expansion components (3) are distributed on the outer wall of the connecting rod (1) along the axial direction of the connecting rod, and the radial length of each expansion component (3) can be adjusted by rotating the adjusting screw (2); a plurality of stress sensing assemblies (4) are distributed on the expansion assembly (3) along the circumferential direction;
one or more fixed seats (5) are further distributed on the outer wall of the connecting rod (1) along the length direction of the connecting rod, and a plurality of strain sensing assemblies (6) extending along the radial direction are uniformly distributed on the circumferential circumference of each fixed seat (5);
the expansion assembly (3) comprises a fixed hinge sleeve (31), a movable hinge sleeve (32) and a scissor connecting rod (33), the fixed hinge sleeve (31) is fixedly sleeved on the periphery of the connecting rod (1), and the movable hinge sleeve (32) is slidably sleeved on the periphery of the connecting rod (1);
the periphery of the outer walls of the fixed hinge sleeve (31) and the movable hinge sleeve (32) is uniformly hinged with a plurality of groups of scissor connecting rods (33) in a distributed manner, each scissor connecting rod (33) is an X-shaped rotatable connecting rod, two ends of one side of each scissor connecting rod are hinged in the fixed hinge sleeve (31) and the movable hinge sleeve (32) respectively, one end of each of two ends of the other side of each scissor connecting rod is hinged on one side of the pressure base (36) through the fixed hinge (34), the other end of each scissor connecting rod is hinged on the other side of the pressure base (36) in a sliding manner through the sliding chute (35), and the pressure base (36) is a long strip-shaped plate;
a through groove (11) penetrating into the outer wall of the connecting rod (1) is formed in a gap between the scissors connecting rods (33) in the movable range of the outer wall of the connecting rod (1) corresponding to the movable hinge sleeve (32), the movable hinge sleeve (32) is fixedly connected with an adjusting nut (322) inside the connecting rod (1) through a connecting rib (321) penetrating through the through groove (11), and the adjusting nut (322) is in threaded connection with the adjusting screw rod (2);
the stress sensing assembly (4) comprises pressure sensors (42), a plurality of pressure sensors (42) are distributed in a pressure base (36) of the expansion assembly (3), the other sides of the pressure sensors (42) are commonly connected into pressure tiles (43), the pressure tiles (43) are arc tile-shaped plates, and an inner wall filling assembly (44) is arranged in one side, away from the pressure sensors (42), of each pressure tile (43);
the inner wall filling assembly (44) comprises a rear bag (441) and a front bag (442), the rear bag (441) is fixedly connected with the pressure tile (43), and the front bag (442) is fixed on the side, away from the pressure tile (43), of the rear bag (441);
the front bag (442) and the rear bag (441) are made of soft materials and are respectively filled with a reagent mixed with an expanding agent;
the rear bag (441) is hermetically connected with the edge of the front bag (442), the gap of the rear bag is a closed cavity, a connecting net (443) is fixed in the cavity, and a plurality of prickling needles (444) with two sharp ends are distributed in the connecting net (443).
2. The integrated device for monitoring the mining stress of the shallow coal seam according to claim 1, wherein the front bladder (442) is fixedly connected with the pressure tile (43) through a connecting layer (45), and the connecting layer (45) is a polystyrene layer.
3. The integrated device for monitoring the mining stress of the shallow coal seam according to claim 1, wherein the strain sensing assembly (6) comprises an outer cylinder (61), the outer cylinder (61) is fixedly connected with the fixed seat (5) and axially extends along the radial direction of the connecting rod (1), the outer cylinder (61) is a hollow cylinder, a push rod (62) telescopically connected with the outer cylinder penetrates through the end face of the outer cylinder (61) far away from the fixed seat (5), a movable sleeve (64) is slidably arranged in the outer cylinder (61), and the movable sleeve (64) is fixedly connected with the push rod (62);
a spring (66) is arranged between one ends, close to the fixed seat (5), of the ejector rod (62) and the outer cylinder (61), and the ejector rod (62) is attached to one end, far away from the fixed seat (5), of the outer cylinder (61) through the spring (66) in a natural state.
4. The integrated device for monitoring the mining stress of the shallow coal seam as claimed in claim 3, wherein the push rod (62) and the movable sleeve (64) are both hollow structures with inner holes, the outer cylinder (61) is internally fixed with a resistance wire cylinder (63) concentric with the outer cylinder, and the diameter of the resistance wire cylinder (63) is smaller than the inner holes of the push rod (62) and the movable sleeve (64) and the inner diameter of the spring (66);
the resistance wire barrel (63) is formed by winding a resistance wire on an insulating barrel, one end close to the fixed seat (5) is led out by a lead, and insulating paint is coated between the resistance wires;
a conductive needle (65) is fixed between the resistance wire cylinder (63) and the spring (66) on one side of the movable sleeve (64) close to the fixed seat (5), and the conductive needle (65) is in contact conduction with the resistance wire cylinder (63);
and a resistance meter is arranged between the conducting needle (65) and a lead-out wire at one end of the resistance wire barrel (63) close to the fixed seat (5).
5. The integrated device for monitoring the mining stress of the shallow coal seam according to claim 4, wherein an electromagnet (67) is fixed in one end of the outer cylinder (61) close to the fixed seat (5), the movable sleeve (64) is made of a magnetic conductive material, and when the electromagnet (67) is electrified, the magnetic force enabling the movable sleeve (64) to overcome the elastic force of the spring (66) and close to the electromagnet (67) can be provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110696242.9A CN113418639B (en) | 2021-06-23 | 2021-06-23 | Integrated device for monitoring mining stress of shallow coal seam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110696242.9A CN113418639B (en) | 2021-06-23 | 2021-06-23 | Integrated device for monitoring mining stress of shallow coal seam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113418639A CN113418639A (en) | 2021-09-21 |
| CN113418639B true CN113418639B (en) | 2022-08-19 |
Family
ID=77716288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110696242.9A Active CN113418639B (en) | 2021-06-23 | 2021-06-23 | Integrated device for monitoring mining stress of shallow coal seam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113418639B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114019136B (en) * | 2021-09-30 | 2022-08-02 | 中国海洋大学 | Formation physicochemical property monitoring equipment |
| CN114754692B (en) * | 2022-03-21 | 2023-06-27 | 蚌埠学院 | Fiber bragg grating sensor and fiber bragg grating type sensing system |
| CN114932648B (en) * | 2022-05-05 | 2023-08-08 | 桂林航天工业学院 | PVC plastic tubing hot press unit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103673982B (en) * | 2013-12-25 | 2018-08-17 | 山东科技大学 | A kind of shallow coal scam overlying strata movement on-Line Monitor Device and method |
| CN110067582B (en) * | 2019-05-05 | 2020-04-21 | 中国矿业大学 | Anchor rod for surrounding rock supporting and instability monitoring and mounting method thereof |
| CN110673205B (en) * | 2019-11-05 | 2021-05-25 | 合肥工业大学 | Micro-seismic sensor taking and placing device with strain gauge pasting structure and using method thereof |
| CN111075487B (en) * | 2019-12-31 | 2024-05-24 | 西南石油大学 | Anchor rod with function of measuring surrounding rock strain and temperature coupling |
| CN211174023U (en) * | 2020-04-29 | 2020-08-04 | 庆阳华宇石油工程技术有限公司 | Combined thermal mass flow profile monitoring device |
| CN112922640B (en) * | 2021-02-03 | 2023-03-14 | 河南城建学院 | Anchor-support combined support body for underground space support |
-
2021
- 2021-06-23 CN CN202110696242.9A patent/CN113418639B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113418639A (en) | 2021-09-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113418639B (en) | Integrated device for monitoring mining stress of shallow coal seam | |
| CN108982219A (en) | Tunnel fault dislocation model test device and dislocation model test system | |
| CN107036895A (en) | The vertical side friction test device of in-situ three-dimensional dead load under ground body opening | |
| GB2049956A (en) | Penetrometer | |
| CN105181199A (en) | Side hole stress releasing method of ground stress test | |
| CN102607967B (en) | Shear measurement device for contractible connecting rod driving type rock-soil aggregate | |
| US20170247950A1 (en) | Anchor rod multi-section reaming machine tool and application thereof | |
| CN114624126B (en) | Rock-soil in-situ shearing test equipment and method | |
| US4058079A (en) | Movement indicator | |
| EP4206646A1 (en) | Similarity simulation test device for solid-liquid coupling of coal and rock mass, and method for using the device | |
| Maji et al. | Numerical modeling of tunneling induced ground deformation and its control | |
| CN102620997A (en) | Contracting-expanding type earth-rock hybrid normal position mechanical property measuring device | |
| CN105928650A (en) | Method for measuring expansion pressure of anchor head of expansion-shell type anchor bolt indoors | |
| US3470701A (en) | Means for making concrete piles | |
| US3507124A (en) | Method for making concrete piles | |
| CN113450543B (en) | Underground space water marginal disaster early warning method based on nuclear magnetic resonance miniature sensor | |
| CN109580281A (en) | Earth's surface original position ground shear test apparatus | |
| CN116147568A (en) | Single-wire distributed multipoint displacement meter device and testing method | |
| CN215910133U (en) | Deep soil body drilling device for geotechnical engineering investigation | |
| CN108918287A (en) | A kind of tunnel creep model experimental rig and test method | |
| CN111380638B (en) | Method for improving actual measurement precision of mining induced stress in solid coal area | |
| CN209485744U (en) | Earth's surface original position ground shear test apparatus | |
| CN211668948U (en) | Indoor drilling perception test system for rock mass mechanical characteristics | |
| CN209053092U (en) | The interim embedded stake that drills of hydraulic engineering | |
| CN209858346U (en) | In-situ experiment device for rock-soil body in rock-soil drilling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |